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Benefit Plans - Additional Information (Details) participant in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Sep. 30, 2019 USD ($) employee company participant | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employee contributions match |  | $ 0.3 | $ 0.4 | $ 0.3
Multiemployer Plans, Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 94.60% |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, number of employees | participant |  | 1.4 |  |
Multiemployer plan, number of companies covered | company |  | 34,000 |  |
Multiemployer plan, contribution rate (less than) |  | 5.00% |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 104.30% |  |
Multiemployer plan, assets |  | $ 94,200.0 |  |
Multiemployer plans, accumulated benefit obligations |  | $ 99,700.0 |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 101.90% |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 92.60% |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | The Netherlands |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, number of employees | employee |  | 75 |  |
Multiemployer Plans, Pension | Recovery Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, percentage decrease in pension rights | 6.30% |  |  |
Multiemployer plan, premium percentage | 16.60% |  |  |

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- Definition Defined Contribution Plan, Coverage Ratio Of Plan Assets To Obligations, Minimum + References No definition available. + Details
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- Definition Multiemployer Plan, Coverage Ratio Of Plan Assets To Obligations + References No definition available. + Details
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- Definition Multiemployer Plan Number Of Companies Covered + References No definition available. + Details
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- Definition Multiemployer Plan Number Of Employees + References No definition available. + Details
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- Definition Multiemployer Plan Percentage Decrease in Pension Rights + References No definition available. + Details
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- Definition Multiemployer Plan Premium Percentage + References No definition available. + Details
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- Definition Multiemployer Plans Contribution Rate + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947 + Details
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- Definition Amount of plan assets attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947 + Details
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